CVE-2026-49357
Published:June 19, 2026
Updated:July 20, 2026
Line Desktop MCP is a project that, while unaffiliated with the official line-bot-mcp-server, allows users to directly operate the LINE Desktop application on Windows or Mac via MCP. "line-desktop-mcp" supports a "--http-mode" Streamable HTTP transport for use with clients such as n8n. In this mode the server binds to "0.0.0.0" and exposes the MCP "/mcp" endpoint without an MCP-layer authentication check. Prior to version 1.1.2, any network client that can reach the port can initialize a session, list tools, and call tools that read LINE Desktop chat history or send LINE messages through the already logged-in desktop application. Version 1.1.2 fixes the issue.
Affected Packages
line-desktop-mcp (NPM):
Affected version(s) >=1.0.0 <1.1.2Fix Suggestion:
Update to version 1.1.2line-desktop-mcp (NPM):
Affected version(s) >=1.0.0 <1.1.2Fix Suggestion:
Update to version 1.1.2Related Resources (4)
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Contact UsCVSS v4
Base Score:
8.8
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
LOW
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
8.2
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
LOW
Availability
NONE
EPSS
Base Score:
0.32